Fan Motor Abnormality Detection Without Air Pressure Sensors
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Solution Overview
Problem
Existing motor drive systems struggle to accurately detect abnormalities in fan bearings due to the reliance on expensive air pressure sensors, which are impractical in closed spaces like server interiors where air pressure fluctuates, making it difficult to monitor this crucial parameter for precise detection.
Innovation Solution
A motor drive control device that includes a drive control signal generation unit, motor drive circuit, communication unit, and monitoring control unit to detect abnormalities by comparing measured parameters like rotational speed, coil current, and coil voltage with reference values from other motors, eliminating the need for air pressure monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If air pressure sensors are used to accurately detect motor bearing abnormalities, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The invention extracts and removes the air pressure sensor from the system, replacing it with a comparative analysis method that uses only the motor's operational parameters (current, voltage, rotational speed) that are already being measured. This eliminates the need for additional sensors while maintaining abnormality detection capability.
Solution Approach 2:
The invention creates a virtual model of normal motor operation by storing reference values of operational parameters under normal conditions. This copied reference data is then compared against real-time measurements to detect abnormalities, replacing the need for physical air pressure sensors.
2Reliability
If air pressure monitoring is implemented for accurate bearing abnormality detection, then reliability is improved, but ease of operation deteriorates in closed spaces
Solution Approach 1:
The motor drive control device performs self-diagnosis by monitoring its own operational parameters (current, voltage, rotational speed) and comparing them against stored reference values. This self-service approach eliminates the need for external air pressure monitoring, making the system equally effective in closed spaces where air pressure fluctuates.
Solution Approach 2:
The system continuously monitors operational parameters and provides feedback by comparing real-time data with reference values. When deviations exceed thresholds, the system generates abnormality notifications. This closed-loop feedback mechanism replaces open-loop air pressure monitoring, enabling reliable operation in enclosed environments.
3Measurement precision
If multiple physical quantity sensors are installed for comprehensive motor monitoring, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The existing operational parameter sensors (current, voltage, rotational speed) are made multi-functional by using them not only for basic motor control but also for bearing abnormality detection. This universal usage eliminates the need for dedicated air pressure sensors, reducing manufacturing costs while maintaining comprehensive monitoring capability.
Solution Approach 2:
The invention merges the abnormality detection function with the existing motor control system by integrating reference value storage, comparison logic, and threshold judgment into the motor drive control device. This consolidation eliminates separate sensing systems and reduces overall manufacturing complexity and cost.
Data Source
AI summary
To appropriately detect an abnormal state of a motor without monitoring air pressure. A motor drive control device includes a monitoring control unit for setting a physical quantity related to operation of a drive-target motor as a monitoring parameter, and monitoring an operation state of the drive-target motor based on measurement data of the monitoring parameter and a reference value of the monitoring parameter. The monitoring control unit determines whether the drive-target motor is in an abnormal state based on a comparison result between a deviation of the measured value from the reference value of the monitoring parameter in the drive-target motor and a deviation of the measured value from the reference value of the monitoring parameter in another motor acquired by a communication unit.